The word genius is over used, but T.S. Eliot was definitely a genius, this is amply reflected in his poetry. Eliot was and still is the dominant figure in modernist poetry, his complicated poetic structure would I'm sure make this a nightmare to analyse if studied, but at the same time is also wonderful to read. It was poets like Eliot showing the world that you didn't need tight, rigid structures and rhymes to create great poetry, indeed try reading some of the poetry out loud, it's beautiful to just listen to. Many will find most of the joy of Eliot's poetry in how wonderful it sounds, and how brilliantly crafted it is, as the meaning of most of the poems will be buried under so many obscure references to things that it will make it impossible to work some of them out.
'The Waste Land' is the most famous Eliot poem, and understandably so, in my opinion, the book is worth buying for this poem alone. 'The Waste Land' is divided into five parts and contains some wonderful, thought provoking imagery throughout, whilst at the same time being flooded with references to obscure pieces of literature from throughout the ages. You will need to buy a set of notes if you want to understand all of the references, but the sense of satisfaction you get from recognising something Eliot is referring to is immense, and you have to read it through first time unaided. (I got a couple of the Hamlet references, that was about it.)The poem is wonderfully crafted and a joy to read, and an even greater joy if you understand it.
But he was by no means a one-poem-wonder, I would highlight 'The Love Song of J. Alfred Prufrock' as being the pick of the rest of the poems, along with 'The Four Quartets,' a four part poem that is absolutely wonderful.
This is to take nothing away for any of the other poems, this edition contains them all and is well worth the money. If you like poetry, and you want to read something that isn't rigidly written, that conatins some wonderful imagery and really makes you think, then buy this now, you wont regret it.